Been a while since I’ve posted something related to technology and this century.  (I should note a red book sighting the other day at NLSO WNY.)  Here is an interesting article.  Of course those of us with the offending L1 GPS systems are quite aware of running into brick walls or cul-de-sacs due to inaccuracies.  But what will the courts do.

Recalculating, Take 5: Is GPS Evidence Too Unreliable To Be Admitted Into Evidence?  Professor Colin Miller posts about a number of items about reliability.

In the article, GPS Evidence Too Unreliable For Legal Purposes, Thomas Claburn provocatively opens by noting:

While the U.S. Supreme Court has yet to weigh in on the constitutionality of warrantless GPS tracking, a more fundamental question may be whether GPS data is reliable enough to be admissible in court.

According to the article, it likely is not. Claburn notes that:

Todd Glassey, chief scientist of Certichron, a time data trust service, and founder of the U.S. Time Server Foundation, argues that GPS devices can be easily jammed and that their data can be spoofed, particularly when tied to cellular systems — as offender tracking bracelets may be.

He then notes that this isn’t a novel concern because "[t]he U.S. Department of Defense has forbidden the use of L1 GPS — the version of GPS available to civilians [and used by many law enforcement entities] — for military purposes since 1998, owing to data integrity and security shortcomings." The article also cites to a research paper by member os the Los Almos National Laboratory Vulnerability Assessment team, which concluded that "Civilian Civilian Global Positioning System (GPS) receivers are vulnerable to attacks such as blocking, jamming, and spoofing."

All of this might come to a head with the D.C. Circuit’s upcoming opinion in United States v. Jones, a case involving the warrantless placement of a GPS device on a suspect’s car. In a technical brief submitted by Glassey in that case, he argued that

"The knowledge of the use of GPS test equipment to alter or affect the readings inside of GPS receivers has already made the jump from the technology community to the hacker community such that commercial products and general knowledge of how to spoof L1 GPS systems is available everywhere."

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